/* 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Lucene.Net.Analysis
{
    
    /// <summary> "Tokenizes" the entire stream as a single token. This is useful
    /// for data like zip codes, ids, and some product names.
    /// </summary>
    public class KeywordAnalyzer:Analyzer
    {
        public KeywordAnalyzer()
        {
            SetOverridesTokenStreamMethod<KeywordAnalyzer>();
        }
        public override TokenStream TokenStream(System.String fieldName, System.IO.TextReader reader)
        {
            return new KeywordTokenizer(reader);
        }
        public override TokenStream ReusableTokenStream(System.String fieldName, System.IO.TextReader reader)
        {
            if (overridesTokenStreamMethod)
            {
                // LUCENE-1678: force fallback to tokenStream() if we
                // have been subclassed and that subclass overrides
                // tokenStream but not reusableTokenStream
                return TokenStream(fieldName, reader);
            }
            var tokenizer = (Tokenizer) PreviousTokenStream;
            if (tokenizer == null)
            {
                tokenizer = new KeywordTokenizer(reader);
                PreviousTokenStream = tokenizer;
            }
            else
                tokenizer.Reset(reader);
            return tokenizer;
        }
    }
}